Escalators are widely used in shopping malls, super markets, and
other public buildings. The main motor keep running at low or even
zero speed while no user on, and once user coming is detected,
repaid and smooth start should be taken action. In this way, the
equipments save normally up to 80% of energy, compare to constant
speed system.

Application Challenges

Quick response

Smooth acceleration and decelerate

Constant speed control

Features of 303 series escalator application

Features

Benefits

flexible input methods

1. Speed input-Take running speed of the motor as the control
objective

Speed input consists of the main speed input, auxiliary speed input
and inching speed input, etc. The actual effective combined speed
input can be either of the three or the combination of either of
the two.

2. Torque input-Take output torque of the motor as the control
objective

Control start/stop with the contact or button to simply realize the
automation control of the entire equipment system.

Vector control 0

Real time estimates speed information of the motor only, without
feedback control, real-time closed-loop control of the current all
the way, 0.50 Hz outputs rated torque of up to 150%, track load
change and limit output current automatically to make it not exceed
the permitted maximum current value.No overcurrent error even if
load mutation, rapid acceleration and deceleration to realize high
performance and high reliability configuration of the universal
Inverter.

Vector control 1

Not only real time estimates speed information of the motor, but
also conduct feedback control, real-time closed-loop control of
both the speed and current all the way, which can realize not only
speed control but also torque control, and can translate universal
AC induction motor into AC speed regulation motor and AC torque
motor by adopting such kind of drive mode. This is a real vector
control Inverter without external speed sensor.

S curve acceleration/deceleration mode

S curve acceleration/deceleration can reduce impact to the machine
at start/stop time, and suitable for the start/stop process for
loads of handling and transmission categories.

A variable-frequency drive (VFD) is a system for controlling the
rotational speed of an alternating current (AC) electric motor by
controlling the frequency of the electrical power supplied to the
motor. A variable frequency drive is a specific type of
adjustable-speed drive. Variable-frequency drives are also known as
adjustable-frequency drives (AFD), variable-speed drives (VSD), AC
drives, microdrives or inverter drives. Since the voltage is varied
along with frequency, these are sometimes also called VVVF
(variable voltage variable frequency) drives.